/* jcifs smb client library in Java
 * Copyright (C) 2000  "Michael B. Allen" <jcifs at samba dot org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.smb1.smb1;

import java.util.Date;

import jcifs.smb1.Config;
import jcifs.smb1.util.Hexdump;

class SmbComOpenAndX extends AndXServerMessageBlock {

    // flags (not the same as flags constructor argument)
    private static final int FLAGS_RETURN_ADDITIONAL_INFO = 0x01;
    private static final int FLAGS_REQUEST_OPLOCK = 0x02;
    private static final int FLAGS_REQUEST_BATCH_OPLOCK = 0x04;

    // Access Mode Encoding for desiredAccess
    private static final int SHARING_COMPATIBILITY = 0x00;
    private static final int SHARING_DENY_READ_WRITE_EXECUTE = 0x10;
    private static final int SHARING_DENY_WRITE = 0x20;
    private static final int SHARING_DENY_READ_EXECUTE = 0x30;
    private static final int SHARING_DENY_NONE = 0x40;

    private static final int DO_NOT_CACHE = 0x1000; // bit 12
    private static final int WRITE_THROUGH = 0x4000; // bit 14

    private static final int OPEN_FN_CREATE = 0x10;
    private static final int OPEN_FN_FAIL_IF_EXISTS = 0x00;
    private static final int OPEN_FN_OPEN = 0x01;
    private static final int OPEN_FN_TRUNC = 0x02;

    private static final int BATCH_LIMIT = Config.getInt("jcifs.smb1.smb.client.OpenAndX.ReadAndX", 1);

    int flags, desiredAccess, searchAttributes, fileAttributes, creationTime, openFunction, allocationSize;

    // flags is NOT the same as flags member

    SmbComOpenAndX(final String fileName, final int access, final int flags, final ServerMessageBlock andx) {
        super(andx);
        this.path = fileName;
        command = SMB_COM_OPEN_ANDX;

        desiredAccess = access & 0x3;
        if (desiredAccess == 0x3) {
            desiredAccess = 0x2; /* Mmm, I thought 0x03 was RDWR */
        }
        desiredAccess |= SHARING_DENY_NONE;
        desiredAccess &= ~0x1; // Win98 doesn't like GENERIC_READ ?! -- get Access Denied.

        // searchAttributes
        searchAttributes = ATTR_DIRECTORY | ATTR_HIDDEN | ATTR_SYSTEM;

        // fileAttributes
        fileAttributes = 0;

        // openFunction
        if ((flags & SmbFile.O_TRUNC) == SmbFile.O_TRUNC) {
            // truncate the file
            if ((flags & SmbFile.O_CREAT) == SmbFile.O_CREAT) {
                // create it if necessary
                openFunction = OPEN_FN_TRUNC | OPEN_FN_CREATE;
            } else {
                openFunction = OPEN_FN_TRUNC;
            }
        } else // don't truncate the file
        if ((flags & SmbFile.O_CREAT) == SmbFile.O_CREAT) {
            // create it if necessary
            if ((flags & SmbFile.O_EXCL) == SmbFile.O_EXCL) {
                // fail if already exists
                openFunction = OPEN_FN_CREATE | OPEN_FN_FAIL_IF_EXISTS;
            } else {
                openFunction = OPEN_FN_CREATE | OPEN_FN_OPEN;
            }
        } else {
            openFunction = OPEN_FN_OPEN;
        }
    }

    @Override
    int getBatchLimit(final byte command) {
        return command == SMB_COM_READ_ANDX ? BATCH_LIMIT : 0;
    }

    @Override
    int writeParameterWordsWireFormat(final byte[] dst, int dstIndex) {
        final int start = dstIndex;

        writeInt2(flags, dst, dstIndex);
        dstIndex += 2;
        writeInt2(desiredAccess, dst, dstIndex);
        dstIndex += 2;
        writeInt2(searchAttributes, dst, dstIndex);
        dstIndex += 2;
        writeInt2(fileAttributes, dst, dstIndex);
        dstIndex += 2;
        creationTime = 0;
        writeInt4(creationTime, dst, dstIndex);
        dstIndex += 4;
        writeInt2(openFunction, dst, dstIndex);
        dstIndex += 2;
        writeInt4(allocationSize, dst, dstIndex);
        dstIndex += 4;
        for (int i = 0; i < 8; i++) {
            dst[dstIndex] = 0x00;
            dstIndex++;
        }

        return dstIndex - start;
    }

    @Override
    int writeBytesWireFormat(final byte[] dst, int dstIndex) {
        final int start = dstIndex;

        if (useUnicode) {
            dst[dstIndex] = (byte) '\0';
            dstIndex++;
        }
        dstIndex += writeString(path, dst, dstIndex);

        return dstIndex - start;
    }

    @Override
    int readParameterWordsWireFormat(final byte[] buffer, final int bufferIndex) {
        return 0;
    }

    @Override
    int readBytesWireFormat(final byte[] buffer, final int bufferIndex) {
        return 0;
    }

    @Override
    public String toString() {
        return ("SmbComOpenAndX[" + super.toString() + ",flags=0x" + Hexdump.toHexString(flags, 2) + ",desiredAccess=0x"
                + Hexdump.toHexString(desiredAccess, 4) + ",searchAttributes=0x" + Hexdump.toHexString(searchAttributes, 4)
                + ",fileAttributes=0x" + Hexdump.toHexString(fileAttributes, 4) + ",creationTime=" + new Date(creationTime)
                + ",openFunction=0x" + Hexdump.toHexString(openFunction, 2) + ",allocationSize=" + allocationSize + ",fileName=" + path
                + "]");
    }
}
